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The 1990 King Cup was the 32nd season of the knockout competition since its establishment in 1956. Al-Hilal were the defending champions but they were eliminated by Al-Riyadh in the Round of 16. This season was the final season of the competition. the Cup then returned under the name of King Cup of Champions in 2008.
The four winners of the quarter-finals progressed to the semi-finals. The semi-finals were played on 17 and 18 May 1990. All times are local, AST (UTC+3).
The final was played between Al-Nassr and Al-Taawoun in the Youth Welfare Stadium in Jeddah. Al-Nassr were appearing in their 10th final while Al-Taawoun reached the final for the first time.